如何使用MySQL中的临时表删除重复项

Question

当Mysql表中只有一列时，如何删除重复项

如果表的行下面..

mysql> select * from EMP ;
+------+
| id   |
+------+
|   10 |
|   10 |
|   10 |
|   20 |
|   20 |
|   30 |
+------+

删除重复项后，我需要行。

10
20
30

我不想使用任何其他临时表。需要删除查询以删除mysql中的重复项

Answer 1

使用distinct

select distinct id from EM

您可以使用row_number()删除重复项：

with todelete as (
      select em.*, row_number() over (partition by id order by id) as seqnum
      from em
     )
delete from todelete
    where seqnum > 1;